Soreness as soon as you bite something after a filling can be treated by adjusting the bite, observation, and re-treatment. 1. Adjustment of bite: Soreness when biting after filling may be caused by high filling material. Adjusting the filling material that is too high and eliminating the trauma of the bite will gradually improve the soreness of the tooth. 2. Observation: no occlusal highs were found after the examination, and there is no pulpitis symptoms, considering the normal reaction after filling, can be temporarily observed, the general symptoms will be relieved. If there is no obvious relief, consult the doctor for further treatment. 3. Re-treatment: If the tooth is still painful after the adjustment observation, you need to re-evaluate the condition of the tooth, and if the pulp is already inflamed, you need to carry out root canal treatment. If the tooth is filled after root canal treatment, there may be residual nerve, then you need to remove the filling material and root fillings cleanly, and re-root canal treatment. If you are sore when you bite something after a filling, go to the hospital in time and follow the advice of a professional physician to choose the most reasonable treatment.